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/*
* Copyright (C) 2011 Google Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "config.h"
#include "ScriptedAnimationController.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "DOMWindow.h"
#include "Document.h"
#include "DocumentLoader.h"
#include "Frame.h"
#include "FrameView.h"
#include "InspectorInstrumentation.h"
#include "Logging.h"
#include "Page.h"
#include "RequestAnimationFrameCallback.h"
#include "Settings.h"
#include <algorithm>
#include <wtf/Ref.h>
#include <wtf/SystemTracing.h>
#include <wtf/text/StringBuilder.h>
// Allow a little more than 60fps to make sure we can at least hit that frame rate.
static const Seconds fullSpeedAnimationInterval { 15_ms };
// Allow a little more than 30fps to make sure we can at least hit that frame rate.
static const Seconds halfSpeedThrottlingAnimationInterval { 30_ms };
static const Seconds aggressiveThrottlingAnimationInterval { 10_s };
#define RELEASE_LOG_IF_ALLOWED(fmt, ...) RELEASE_LOG_IF(page() && page()->isAlwaysOnLoggingAllowed(), PerformanceLogging, "%p - ScriptedAnimationController::" fmt, this, ##__VA_ARGS__)
namespace WebCore {
ScriptedAnimationController::ScriptedAnimationController(Document& document)
: m_document(makeWeakPtr(document))
, m_animationTimer(*this, &ScriptedAnimationController::animationTimerFired)
{
}
ScriptedAnimationController::~ScriptedAnimationController() = default;
bool ScriptedAnimationController::requestAnimationFrameEnabled() const
{
return m_document && m_document->settings().requestAnimationFrameEnabled();
}
void ScriptedAnimationController::suspend()
{
++m_suspendCount;
}
void ScriptedAnimationController::resume()
{
// It would be nice to put an ASSERT(m_suspendCount > 0) here, but in WK1 resume() can be called
// even when suspend hasn't (if a tab was created in the background).
if (m_suspendCount > 0)
--m_suspendCount;
if (!m_suspendCount && m_callbacks.size())
scheduleAnimation();
}
#if USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR) && !RELEASE_LOG_DISABLED
static const char* throttlingReasonToString(ScriptedAnimationController::ThrottlingReason reason)
{
switch (reason) {
case ScriptedAnimationController::ThrottlingReason::VisuallyIdle:
return "VisuallyIdle";
case ScriptedAnimationController::ThrottlingReason::OutsideViewport:
return "OutsideViewport";
case ScriptedAnimationController::ThrottlingReason::LowPowerMode:
return "LowPowerMode";
case ScriptedAnimationController::ThrottlingReason::NonInteractedCrossOriginFrame:
return "NonInteractiveCrossOriginFrame";
}
}
static String throttlingReasonsToString(OptionSet<ScriptedAnimationController::ThrottlingReason> reasons)
{
if (reasons.isEmpty())
return "[Unthrottled]"_s;
StringBuilder builder;
for (auto reason : reasons) {
if (!builder.isEmpty())
builder.append('|');
builder.append(throttlingReasonToString(reason));
}
return builder.toString();
}
#endif
void ScriptedAnimationController::addThrottlingReason(ThrottlingReason reason)
{
#if USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR)
if (m_throttlingReasons.contains(reason))
return;
m_throttlingReasons.add(reason);
RELEASE_LOG_IF_ALLOWED("addThrottlingReason(%s) -> %s", throttlingReasonToString(reason), throttlingReasonsToString(m_throttlingReasons).utf8().data());
if (m_animationTimer.isActive()) {
m_animationTimer.stop();
scheduleAnimation();
}
#else
UNUSED_PARAM(reason);
#endif
}
void ScriptedAnimationController::removeThrottlingReason(ThrottlingReason reason)
{
#if USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR)
if (!m_throttlingReasons.contains(reason))
return;
m_throttlingReasons.remove(reason);
RELEASE_LOG_IF_ALLOWED("removeThrottlingReason(%s) -> %s", throttlingReasonToString(reason), throttlingReasonsToString(m_throttlingReasons).utf8().data());
if (m_animationTimer.isActive()) {
m_animationTimer.stop();
scheduleAnimation();
}
#else
UNUSED_PARAM(reason);
#endif
}
bool ScriptedAnimationController::isThrottled() const
{
#if USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR)
return !m_throttlingReasons.isEmpty();
#else
return false;
#endif
}
ScriptedAnimationController::CallbackId ScriptedAnimationController::registerCallback(Ref<RequestAnimationFrameCallback>&& callback)
{
ScriptedAnimationController::CallbackId id = ++m_nextCallbackId;
callback->m_firedOrCancelled = false;
callback->m_id = id;
m_callbacks.append(WTFMove(callback));
if (m_document)
InspectorInstrumentation::didRequestAnimationFrame(*m_document, id);
if (!m_suspendCount)
scheduleAnimation();
return id;
}
void ScriptedAnimationController::cancelCallback(CallbackId id)
{
for (size_t i = 0; i < m_callbacks.size(); ++i) {
if (m_callbacks[i]->m_id == id) {
m_callbacks[i]->m_firedOrCancelled = true;
InspectorInstrumentation::didCancelAnimationFrame(*m_document, id);
m_callbacks.remove(i);
return;
}
}
}
void ScriptedAnimationController::serviceRequestAnimationFrameCallbacks(DOMHighResTimeStamp timestamp)
{
if (!m_callbacks.size() || m_suspendCount || !requestAnimationFrameEnabled())
return;
TraceScope tracingScope(RAFCallbackStart, RAFCallbackEnd);
// We round this to the nearest microsecond so that we can return a time that matches what is returned by document.timeline.currentTime.
DOMHighResTimeStamp highResNowMs = std::round(1000 * timestamp);
// First, generate a list of callbacks to consider. Callbacks registered from this point
// on are considered only for the "next" frame, not this one.
CallbackList callbacks(m_callbacks);
// Invoking callbacks may detach elements from our document, which clears the document's
// reference to us, so take a defensive reference.
Ref<ScriptedAnimationController> protectedThis(*this);
Ref<Document> protectedDocument(*m_document);
for (auto& callback : callbacks) {
if (callback->m_firedOrCancelled)
continue;
callback->m_firedOrCancelled = true;
InspectorInstrumentationCookie cookie = InspectorInstrumentation::willFireAnimationFrame(protectedDocument, callback->m_id);
callback->handleEvent(highResNowMs);
InspectorInstrumentation::didFireAnimationFrame(cookie);
}
// Remove any callbacks we fired from the list of pending callbacks.
m_callbacks.removeAllMatching([](auto& callback) {
return callback->m_firedOrCancelled;
});
if (m_callbacks.size())
scheduleAnimation();
}
Seconds ScriptedAnimationController::interval() const
{
#if USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR)
if (m_throttlingReasons.contains(ThrottlingReason::VisuallyIdle) || m_throttlingReasons.contains(ThrottlingReason::OutsideViewport))
return aggressiveThrottlingAnimationInterval;
if (m_throttlingReasons.contains(ThrottlingReason::LowPowerMode))
return halfSpeedThrottlingAnimationInterval;
if (m_throttlingReasons.contains(ThrottlingReason::NonInteractedCrossOriginFrame))
return halfSpeedThrottlingAnimationInterval;
ASSERT(m_throttlingReasons.isEmpty());
#endif
return fullSpeedAnimationInterval;
}
Page* ScriptedAnimationController::page() const
{
return m_document ? m_document->page() : nullptr;
}
void ScriptedAnimationController::scheduleAnimation()
{
if (!requestAnimationFrameEnabled())
return;
#if USE(REQUEST_ANIMATION_FRAME_DISPLAY_MONITOR)
if (!m_isUsingTimer && !isThrottled()) {
if (auto* page = this->page()) {
page->renderingUpdateScheduler().scheduleRenderingUpdate();
return;
}
m_isUsingTimer = true;
}
#endif
if (m_animationTimer.isActive())
return;
Seconds animationInterval = interval();
Seconds scheduleDelay = std::max(animationInterval - Seconds(m_document->domWindow()->nowTimestamp() - m_lastAnimationFrameTimestamp), 0_s);
if (isThrottled()) {
// FIXME: not ideal to snapshot time both in now() and nowTimestamp(), the latter of which also has reduced resolution.
MonotonicTime now = MonotonicTime::now();
MonotonicTime fireTime = now + scheduleDelay;
Seconds alignmentInterval = 10_ms;
// Snap to the nearest alignmentInterval.
Seconds alignment = (fireTime + alignmentInterval / 2) % alignmentInterval;
MonotonicTime alignedFireTime = fireTime - alignment;
scheduleDelay = alignedFireTime - now;
}
m_animationTimer.startOneShot(scheduleDelay);
}
void ScriptedAnimationController::animationTimerFired()
{
m_lastAnimationFrameTimestamp = m_document->domWindow()->nowTimestamp();
serviceRequestAnimationFrameCallbacks(m_lastAnimationFrameTimestamp);
}
}